Phytophthora infestans is the most serious disease that damages the litchi fruit and fruit. It causes the spikes to dry, the young fruit to fall off, the mature fruit to rot and deteriorate, and is covered with white bachelor layer, which emits the odor of wine sour that the fruit set rate is significantly reduced. And caused a failure to reduce production, we must pay attention to prevention and treatment to promote flower and fruit. Specific prevention and technical measures are as follows:
When the litchi flower spikes are just sprouting, when the flower spike length is about 5 to 10 cm and the buds are significantly enlarged, they must be sprayed with 800-fold thiophanate-methyl solution, or 600-fold aqueous solution of enemy ducks, or 800 times each. The aqueous carbendazim solution eliminates germs adsorbed on flower spikes and protects flower spikes. When litchi first appeared in fruit and young fruit began to nucleate, then 400 times mancozeb aqueous solution or 600 times aqueous solution of ethylphosphorus aluminum was sprayed on the leaves once more to eliminate the bacteria that were adsorbed on the young fruit. Young fruit. When the fruit is just beginning to turn red, it must be continuously sprayed twice or three times with 800 times the aqueous solution of rebamimer, or 1,000 times the aqueous solution of poisonous antimony, or 600 times the solution of Dasheng M, spraying once every 7-10 days, uniformly spraying the inside and outside of the canopy All the fruits are suitable to start dropping with drops of water. When rain falls within 4 hours after spraying, it should be re-applied again to improve the control effect.
When the medicine is used, it is necessary to alternately use various medicines. Do not use the same medicine more than once in a row to avoid drug resistance and reduce the control effect. If we can simultaneously add 1000 times Zengfengyou solution, or 1500 times Shennongsu chelate solution with the spray, the effect is better, both to strengthen the efficacy of sterilization and treatment, improve control, but also enhance disease resistance, Accelerate the normal growth of diseased flowers and flowers, can also promote flower spikes and young fruit, and promote flowering results.
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